I see a lot of comments about who would use 512 GB, let alone 1024 GB.

I would. I stream a lot and when using public transportation I go to a lot of places that don't have all that great of a LTE connection, so despite unlimited data I store alot offline. That's too say a 40 GB spotify library and a bunch of Netflix movies. I also frequently help people with their computers, so there's a lot of software on my phone as well that I can use to help people.

I store a lot of pictures and private videos too (recorded in 4K, I like it future-proof so it'll still be sharp-looking when I show my 10 month old daughter in 18 years) as well a whole bunch of e-books and documents.

I synchronize my files into specific folders across devices using OneSync.

So yes there are people that would use the FULL 512 GB or 1 TB, because it eliminates the plug in -> transfer files -> wait 6 hours problem, or the problem of forgetting to bring a cable and a whole bunch of other things.

I truly use it as a mini-computer, found a great app for editting photo's too.

You can do almost everything on your phone that you can do in Windows. On the road I use I also use it for work when I need too. Sometimes Windows annoys the living crap out of me, so if I need to do anything at home and it isn't all that much, I don't mind doing it on my phone.